Five hours have passed. It was nearly six o'clock in the afternoon, but the sun was still quiet. Neither satellites, observatories, nor radio telescopes have received any signals from the direction of the sun with logical characteristics.

Perhaps, as the head of the observatory said, "Either that K2-class civilization doesn't exist, or they ignore us." Now, five hours later, because of the angle difference caused by the rotation of the earth, even if the direction of the sun really transmits the signal, the galaxy radio telescope will not be able to receive it.

Obviously, because they are built in the middle of a valley, the Galaxy radio telescope is not free to rotate to align in different directions. It can only follow the Earth and scan a certain range of the celestial sphere along a fixed orbit.

However, it doesn't matter if the Galaxy radio telescope can't monitor the sun. At this very moment, free-spinning radio telescopes built elsewhere on Earth are still chasing the sun until it sets.

The most intense surveillance operation will last for three days. If no information comes back after three days, the monitoring of the direction of the sun will not stop. There will still be at least two large radio telescopes for this task.

"Then wait three days." Zhao Huasheng said: "Some people may think that it is easier to communicate with extraterrestrial civilizations to change the current predicament than to rely on our own power to change the sun, but I don't think so. I think we still have some opportunities if the sun is due to a change in its own physical mechanism. If there really is a K2-level civilization, we don't have any chance. So...... I hope that the direction of the sun will never have a reply coming back. ”

"Anyway, let's wait for these three days." said the head of the observatory.

Zhao Huasheng stayed in the Galaxy Observatory with Li Wei, Meng Zhuo and others. After the Galaxy Radio Telescope could no longer observe the Sun due to the rotation of the Earth, the Galaxy Observatory re-entered the daily rhythm of work.

This is the most sensitive ear that human civilization has ever built. It can even listen to radiation emitted by distant river systems seven billion light-years away. Since the completion of the Galaxy Radio Telescope, it has discovered at least 500 neutron stars and white dwarfs, and through gamma-ray monitoring, it has identified at least 300 new stars that appear to be black holes. There are many very important discoveries in the areas of close binary stars, Cepheid variables, supernova explosions, binary neutron star or white dwarf star systems, and compact star-main-sequence star models.

There is a huge amount of radiation and signals in the universe all the time, and the role of the galaxy radio telescope is to listen to these signals, eliminate useless interference, and screen out the signals that are valuable for astronomical research.

Zhao Huasheng is also a heavenly family, although the research direction is different from that of the Galaxy Observatory, but this does not prevent Zhao Huasheng from participating. Zhao Huasheng stayed at the Galaxy Observatory for three days until noon on the third day.

Seventy-two hours had passed, and the direction of the sun was still silent, still silent. There is not a single receiving device in the world that has received even a suspicious signal.

It was also at this time that Zhao Huasheng received a notice from Wang Tang: "With the consent of the Führer, we have decided to restart the solar exploration program. There will be at least thirty probes, as well as a manned spacecraft leaving Earth for the Sun. ”

"Good." Zhao Huasheng said, "When will it be launched?" ”

"Tomorrow the astronauts will depart from Earth."

"Okay, I'll go see them off too."

"Welcome." Wang Tang said.

The communication was cut off, and Zhao Huasheng said to Meng Zhuo: "There is still a period of time before the rocket launches, let's go to the Vulcan solar telescope to have a look." Maybe you can find some clues left by Director Li Qi there. ”

"Okay." Meng Zhuo agreed, and after an hour of preparation, five helicopters carrying Zhao Huasheng and his party left the Galaxy Observatory and began to set off for the Vulcan solar telescope.

The Vulcan Solar Telescope is an optical telescope, so it must be built in a place with clean air to reduce the influence of the atmosphere on light, so as to improve the accuracy of observations. In fact, the Vulcan telescope was built on a mountain range that is more than 5,000 meters above sea level and is characterized by year-round drought and scarce rainfall.

It is located at a low latitude, and although the solar radiation has decreased considerably, the temperature of the plains here remains above freezing. But it's not the same in the mountains. At an altitude of more than 5,000 meters, the temperature has dropped to about minus 30 degrees. In the midst of such severe cold, the helicopter that Zhao Huasheng was riding in came to the open space in front of the Vulcan telescope.

The person in charge of the Vulcan telescope base received Zhao Huasheng and his party. After taking Zhao Huasheng from the cold outside to the base, he left alone, and changed to another person to accompany Zhao Huasheng and the others. This is a middle-aged man with glasses and a pen in his jacket pocket, who looks very much like an intellectual of the last century.

"That's right, our telescope was indeed built by Director Rich." The middle-aged man said, "After the tragic death of Director Li Qi, at least seven groups of people from the scientific research department have come here to check on them, and none of them have found anything valuable. Why, are you also from the research department? Come here to check on what Li Qi is good at? ”

Zhao Huasheng nodded, "Yes, we hope to find a little clue left by Director Li Qi here." ”

"No, not at all." The middle-aged man shook his head with regret, "Director Li Qi also has the authority to this telescope, but after this telescope was completed and put into use, he never paid attention to it again except for receiving the observation data here. How could there be anything left here that Li Qi was good at? ”

Zhao Huasheng asked: "Director Li Qi also has the authority to operate this telescope?" Is it possible that this could happen that Richie could operate the telescope with his own authority to make certain observations without going through you? ”

"Theoretically, this is a possibility." The thin middle-aged man said, "But the first seven groups of investigators from the scientific research department have already investigated this matter, and they don't seem to have found anything." ”

"Yes, the research department has investigated this matter." "Investigators didn't find any traces left by Rich. There are two possibilities in this situation, one, Li Qi really didn't do anything, and second, Li Qi did the operation, but he removed these traces perfectly. We don't know exactly which one it will be. Because this information is of little value, I didn't report it to you. ”

"Hmm." Zhao Huasheng nodded, thought for a while, turned his head to Li Wei and asked, "Since it is an optical telescope, have any people from your Institute of Optics participated in the construction of this telescope?" ”

"Participated." "Investigators also investigated the construction drawings and technical parameters of the telescope, and found nothing unusual. ”

"That's ......" Zhao Huasheng pondered again, and said to the thin middle-aged man, "Can we go and take a look at this telescope?" ”

"Of course." The middle-aged man said, "We can get there by car." ”

The group took a car to the huge factory where the telescope was located.

Optical telescopes are different from radio telescopes in that they are not lid-shaped curved surfaces, but a tube structure in the traditional sense, but much larger. When it is to be used, the baffle above the plant is removed, and light from a distance enters its mirror.

Although it is also a mirror structure, it is different from other telescopes. Because other telescopes are mainly used to observe extremely distant celestial bodies, it is to observe the sun. The sun is too big and too close, and if left untreated, the condenser gathers enough sunlight to melt the steel plates. Therefore, there are multiple light filters on the outside of this telescope, and the staff at the base can easily adjust the intensity of light entering the telescope by relying on the observation needs.

There are a lot of staff members who are busy here. On the huge screen in the factory, Zhao Huasheng also saw the real-time image of the sun. It was a large, red-hot fireball that looked terrifying, even after a great deal of dimming.

Because of the outbreak of the solar crisis, the telescope's observation mission has increased dramatically, and even the staff here has increased by three or four times compared to the past.

Zhao Huasheng didn't speak, just strolled around the busy researchers, looking at the layout here, looking at the data transmitted back, and occasionally looking at the huge telescope mirror.

After a while, Zhao Huasheng asked thoughtfully: "How accurate can this telescope be in distinguishing the sun's rays?" ”

"Resolving accuracy? What do you mean? The thin middle-aged man asked with some confusion.

"Light intensity. For example," said Zhao Huasheng, "if it were to be at the highest accuracy, would it be possible for it to detect a specific area of the sun, which may be very small, but if it is ten square kilometers, it would be able to detect the change in the intensity of light in those ten square kilometers?" ”

"Of course you can find out." The thin middle-aged man said, "This telescope is very powerful, it is one of the most advanced ground-based telescopes we humans have built. ”

"What kind of accuracy can be achieved? Can a one-millionth change in luminosity be detected? Zhao Huasheng then asked.

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